* Your Owner's Manual: This is the first and best place to look. The owner's manual should have a section detailing engine specifications, including the firing order.
* Mercury Marine's Website: Go to the Mercury Marine website (mercurymarine.com) and look for their service manuals or owner's manuals section. You may need to input your engine's serial number to find the correct documentation.
* A Mercury Marine Dealer or Mechanic: They will have access to service manuals and can quickly provide the firing order.
* Online Forums: Websites and forums dedicated to boating and Mercury outboards may have discussions about your specific engine model, where someone might have already posted the firing order. However, always verify information found online from multiple reliable sources.
Important Note: The exact firing order can vary slightly depending on the specific year and model of your 140 HP Mercury Cruiser engine. Therefore, using the serial number when searching online or contacting Mercury Marine is crucial for accuracy.
